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The Chairman - At the age of 24, Medvedev was invited to join St. Petersburg's regional administration, run by Putin. Upon becoming prime minister in 1999, Putin called on Medvedev to become his chief of staff. The protege eventually rose to presidential chief of staff, and soon after was rewarded with the most coveted job in the country’s booming energy sector -- the chairmanship of the state-run gas giant Gazprom.